Management Questions for the CEN Exam — Practice Free

The goal for Door-to-Balloon (D2B) time at a PCI-capable facility is ≤90 minutes from the time of arrival. Clinical Pearls: 1. The clock starts at the moment of ED arrival (or First Medical Contact if EMS performs EKG). 2. PCI is the preferred reperfusion strategy for STEMI if it can be performed timely. 3. CEN Exam Tip: BCEN emphasizes the 90-minute benchmark for PCI-capable centers vs. the 120-minute benchmark for patients requiring transfer from a non-PCI center.

Anti-Xa levels (target range typically 0.3–0.7 IU/mL) are the preferred monitoring standard in 2026. Anti-Xa provides a more stable correlation with heparin concentration than aPTT, which is often affected by heparin resistance, elevated Factor VIII, or fibrinogen levels common in acute PE. BCEN Tip: If aPTT is mentioned, look for 1.5 to 2.5 times the control, but prioritize Anti-Xa as the modern gold standard.

Any of the following: Platelets <100,000, Creatinine >1.1 (or doubling of baseline), Pulmonary Edema, New-onset cerebral/visual disturbances (severe headache, scotoma), or AST/ALT >2x normal. BCEN Exam Tip: Proteinuria is no longer required for the diagnosis of pre-eclampsia if these severe features or other end-organ dysfunctions are present.

Supplemental oxygen is only indicated if the patient is hypoxic (SpO2 <92-95% or on room air). Rationale: In non-hypoxic patients, supplemental O2 can suppress erythropoiesis (red blood cell production), potentially worsening anemia after the crisis. It does not reduce pain or shorten the VOC duration. CEN Tip: BCEN often tests next steps or appropriate interventions; do not reflexively apply O2 to an SCD patient unless hypoxia is documented.

Usually 12–24 hours post-injury. Early administration (<12h) is avoided because increased capillary permeability allows albumin to leak into the interstitium, worsening edema. After 12–24h, capillary integrity begins to return, and colloids help maintain intravascular volume and reduce total fluid.